On Innistrad she found the mystery of the great silver moon that hung in the sky. Tamiyo observed Innistrad for many cycles, using her powers as a Planeswalker to gain insight into the forces the moon exerted on the world below. She watched with rapt attention how the moon affected the werewolves and vampires on Innistrad, and she wrote extensive notes on the ebb and flow of violent frenzies in relation to the moon's influence.

Her curiosity eventually led her to the door of the famed Nephalian astronomancer Jenrik. Tamiyo spent months in his moonstone tower poring over countless charts, adding her own observations to his collection about the odd power the moon holds over the denizens and populace of this plane.

When Avacyn was freed from the Helvault Tamiyo excitedly began writing theories about the angel's influence on the land, its creatures, and the moon. The nature of the Helvault, the creation of the wolfir, the reappearance of the gryffs, and the origins of the newly empowered holy wards have been filling her scrolls with further questions.